Agreed. FYI, ffmpeg's hash testing format [0], and therefore my utility dano, allows the use of CRC32, etc., though.

> But I'm afraid we'll have to live with this shortcoming forever now ¯\_(ツ)_/¯

I don't believe there is a fundamental reason why a later version of FLAC couldn't/wouldn't allow different algos as I think the raw decoded bitstream is checksum-ed and is just stored as a FLAC tag[1]. So they could just version that tag.

[0]: http://underpop.online.fr/f/ffmpeg/help/hash.htm.gz [1]: Language corrected. See comment.